Question

Solve by substitution x+y=7and 12+5y =7

Answer 1

$\textbf{Answer :}$

The given equations are

x + y = 7

=> x = 7 - y ...(i)

12x + 5y = 7 ...(ii)

Now, substituting the value of x,
x = 7 - y from (i), in (ii), we get

12 (7 - y) + 5y = 7

=> 84 - 12y + 5y = 7

=> 7y = 77

=> y = 11

Now, putting y = 11 in (i), we get

x = 7 - y

= 7 - 11

= - 4

Therefore, the required solution be

$\textbf{x = - 4 and y = 11}$

#$\textbf{MarkAsBrainliest}$

Answer 2

HEY DEAR,---------------------------------------------------------------------------------------------------------HERE IS UR ANSWER........................        x+y=7        x=7-y............................(1.)   12x+5y=7    12(7-y)+5y=7               ...................from(1.)     84-12y+5y=7     -7y=-77      y=11   put in 1. equation    x=-4---------------------------------------------------------------------------------------------ur question is wrong i think it should be like i solved;;;;;HOPE IT RIGHT AND USEFUL...............i tried my best to help uhthanku@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@